CN107557115B - Solid lubricant for kiln and converter and preparation process thereof - Google Patents
Solid lubricant for kiln and converter and preparation process thereof Download PDFInfo
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- CN107557115B CN107557115B CN201710666344.XA CN201710666344A CN107557115B CN 107557115 B CN107557115 B CN 107557115B CN 201710666344 A CN201710666344 A CN 201710666344A CN 107557115 B CN107557115 B CN 107557115B
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Abstract
The invention discloses a solid lubricant for a kiln converter and a preparation process thereof, wherein the solid lubricant comprises the following components in percentage by weight: 55% -75% of a lubricant; 2.5 to 10 percent of lubricating additive; 1.2 to 1.6 percent of thickening agent; 13% -23% of a flame retardant; 15% -25% of a friction modifier; 0 to 2 percent of antifriction agent. The solid lubricant for the kiln and the converter, disclosed by the invention, is characterized by effectively reducing the friction coefficient, having positive friction characteristic, high temperature resistance, high mechanical strength, good wear resistance and simplicity in use. Can effectively reduce the abrasion of kiln rotary furnace equipment, reduce the operation noise and facilitate the cleaning work of the operation table.
Description
Technical Field
The invention relates to a solid lubricant for a kiln converter and a preparation process thereof.
Background
With the development of solid lubricating materials, liquid or semi-liquid lubricating means like greases, solid-liquid-solid type increasingly show limitations. The outstanding problem is that under the action of high-speed airflow, sprayed fluid lubricant scatters, so that equipment and environment are polluted, the lubricating effect is reduced, and the management difficulty is increased.
The solid lubricating material used in the kiln converter, namely the kiln body rotary furnace, must satisfy: can form a solid lubricating film at high temperature, has good performance, resists high pressure and can resist flame. The resistance of the kiln converter can be greatly reduced through lubrication, the effect of the composite material has important influence on the running speed and the service life of equipment, the solid lubricating material for the domestic high-speed kiln converter basically depends on import, developed countries abroad monopolize the field, and strict confidentiality measures are taken for the core technology, so that the high-performance composite material for the solid lubricating of the kiln converter with independent intellectual property rights is urgently needed to be developed. The common solid lubricating material of the phenolic resin system has the defects of high brittleness, poor impact resistance and undesirable modification effect; the products of the unsaturated polyester resin system have shrinkage, are easy to deform and have long odor time. The wax material has low cost and wide application, and the polyethylene wax or the polypropylene wax can meet the requirements of heat resistance and wear resistance, has good bonding property with inorganic powder and can serve as a lubricant and a dispersant. Therefore, a paraffin system is considered as the solid lubricating material for the kiln and the converter.
Disclosure of Invention
Based on the defects of the prior art, the technical problem solved by the invention is to provide a formula of a solid lubricant for a kiln converter and a preparation method thereof. Solid lubricant blocks are applied to the edge of the wheel of the kiln body rotary furnace before use, so that the abrasion of kiln body equipment can be effectively reduced, the noise is reduced, and the cleaning convenience is improved.
In order to solve the technical problems, the invention provides a solid lubricant for a kiln converter, which is characterized by comprising the following components in percentage by mass:
55% -75% of a lubricant; 2.5 to 10 percent of lubricating additive; 1.2 to 1.6 percent of thickening agent; 13% -23% of a flame retardant; 15% -25% of a friction modifier; 0 to 2 percent of antifriction agent.
As a preferred aspect of the above technical solution, the solid lubricant for a kiln converter provided by the present invention further includes part or all of the following technical features:
as an improvement of the technical scheme, the lubricant is paraffin.
As an improvement of the technical scheme, the paraffin wax is polyethylene wax or polypropylene wax.
As an improvement of the technical scheme, the lubricating assistant is graphite.
As an improvement of the technical scheme, the thickening agent is organic bentonite.
As an improvement of the technical scheme, the flame retardant is magnesium hydroxide.
As an improvement of the technical scheme, the friction modifier is talcum powder.
As an improvement of the technical scheme, the wear-resisting agent is zinc powder.
A preparation process of a solid lubricant for a kiln converter is characterized by comprising the following steps:
step one, weighing the following substances in percentage by mass: 55% -75% of a lubricant; 2.5 to 10 percent of lubricating additive; 1.2 to 1.6 percent of thickening agent; 13% -23% of a flame retardant; 15% -25% of a friction modifier; 0% -2% of antifriction agent; mixing and crushing;
step two, melting and dispersing the product obtained in the step one for 20-30min at the temperature of 200-;
step three, pouring the melt obtained in the step two into a forming die (shown in figure 2) while the melt is hot, and cooling for 3-10min at normal temperature for forming;
and step four, taking the solid lubricant solidified in the step three out of the die to obtain a finished product of the solid lubricant for the kiln converter.
As a preferred aspect of the above technical solution, the preparation process of the solid lubricant for a kiln converter provided by the present invention further includes part or all of the following technical features:
as an improvement of the above technical scheme, the lubricant is paraffin wax, specifically polyethylene wax or polypropylene wax; the lubricating assistant is graphite; the thickening agent is organic bentonite; the flame retardant is magnesium hydroxide; the friction modifier is talcum powder; the wear-resisting agent is zinc powder.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) the invention mainly takes paraffin as the lubricant, the prepared solid lubricant has excellent mechanical property, can be effectively and uniformly coated on a kiln rotary furnace and forms a layer of solid lubricant film through rolling on the rotary furnace, and has stable friction coefficient;
(2) the friction modifier added in the invention can endow the lubricant with positive friction characteristic, thereby effectively inhibiting the abrasion between rotating wheels and reducing the generation of noise;
(3) the thickening agent added in the invention can mainly change the bonding strength, the friction performance and the heat resistance among solid lubricating material particles;
(4) the preparation method has simple process and low cost, and can realize industrialized large-scale application.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the contents of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a flow chart of the preparation of a solid lubricant for a kiln converter according to a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a mold used in a process of manufacturing a solid lubricant for a kiln converter according to a preferred embodiment of the present invention;
FIG. 3 is a graph of the friction coefficient of a solid lubricant for a kiln converter according to an embodiment of the present invention; wherein FIG. 3a is a graph of the friction coefficient of the solid lubricant for a kiln converter of example 1 of the present invention; FIG. 3b is a graph of the friction coefficient of the solid lubricant for a kiln converter of example 2 of the present invention; FIG. 3c is a graph of the friction coefficient of the solid lubricant for a kiln converter of example 3 of the present invention; FIG. 3d is a graph of the friction coefficient of the solid lubricant for a kiln converter of example 4 of the present invention;
FIG. 4 is a graph of the film formation on a steel disc after a friction test of a solid lubricant for a kiln converter according to an embodiment of the present invention; wherein, FIG. 4a is a film formation pattern on a steel disc after a friction test of a solid lubricant for a kiln converter of example 1 of the present invention; FIG. 4b is a graph showing the film formation on the steel disc after the friction test of the solid lubricant for kiln converters of example 2 of the present invention; FIG. 4c is a graph showing the film formation on the steel disc after the friction test of the solid lubricant for kiln converters of example 3 of the present invention; FIG. 4d is a graph showing the film formation on the steel disc after the friction test of the solid lubricant for kiln converters of example 4 of the present invention.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
Polyethylene wax or polypropylene wax is a polymer wax widely used because of its excellent cold resistance, heat resistance, chemical resistance and wear resistance. As a lubricant, it is chemically stable, has good electrical properties, and has a stronger internal lubricating effect than other external lubricants.
The solid lubricating material is a chemical substance, a compound or a mixture thereof capable of reducing the friction coefficient of two surfaces in a sliding or rolling-sliding state, and the lubricating aid is preferably graphite.
The friction modifier is a substance for endowing the lubricant with positive friction characteristics, and can be used as a space filler to improve the physical and mechanical properties of the material, adjust the friction performance and reduce the cost in the friction material. The friction modifier is preferably talc.
The thickening agent plays a role in reinforcing, so that the friction material has certain mechanical effects of strength, toughness, impact resistance, shearing, stretching and the like without generating mechanical damage such as cracks, fractures and the like, and the friction performance and the heat resistance are improved. As the thickener, bentonite, organobentonite, sodium bentonite and the like are generally used. Organobentonite is preferred.
The flame retardant is a functional assistant for endowing inflammable polymers with flame resistance, and is mainly an accelerant designed aiming at the flame resistance of high polymer materials. The additive flame retardant is added into the polymer by a mechanical mixing method to enable the polymer to have flame retardance, and at present, the additive flame retardant mainly comprises an organic flame retardant, an inorganic flame retardant, a halogen flame retardant (organic chloride and organic bromide) and non-halogen. Organic flame retardants are represented by bromine, phosphorus-nitrogen, red phosphorus and compounds, and inorganic flame retardants are mainly flame retardant systems such as antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon and the like. From the viewpoint of industrial production, magnesium hydroxide is preferred.
The wear-resisting agent is an industrial material and belongs to a functional substance. The wear-resisting agent can increase the wear resistance, heat resistance and stress resistance of the material, so that the material is not easy to decompose or wear. Zinc powder is preferred.
Example 1
The formulation amounts of a solid lubricant for a kiln converter are given in table 1 below.
Table 1 example 1 amounts of each raw material component in the lubricant
A solid lubricant for a kiln converter is prepared by the following method:
(1) material mixing process
Weighing measured solid powder materials, mixing the solid powder materials including a lubricant (polyethylene wax), a lubricating aid (graphite), a thickening agent (organic bentonite), a flame retardant (magnesium hydroxide) and a wear-resisting agent (zinc powder), pouring the mixture into a high-speed pulverizer, pulverizing and uniformly mixing;
(2) melt dispersion process
Pouring the mixed materials into a beaker, placing the beaker in an electric heating sleeve, controlling the digital display temperature at 200 ℃, and heating and melting. Opening a dispersion machine, adjusting the revolution to 600r/min, and dispersing the sample while melting for 20 min;
(3) normal temperature curing process
Pouring the solid lubricant into a forming mold (the size of which is shown in figure 2) from a beaker while the solid lubricant is hot, cooling and forming at normal temperature, and solidifying after 5 min;
(4) cooling demolding process
And taking out the solidified solid lubricant from the die to obtain a finished product.
The prepared lubricant has the use temperature range of-20 ℃ to 400 ℃. The friction test was carried out under a load of 20N and a friction speed of 1.2m/s for a test time of 30 min. And (3) testing results: the coefficient of friction was 0.232 (as shown in FIG. 3 a) and the wear loss was 0.0102 g. As shown in fig. 4a, the film formed on the steel disc after the friction test of the product of this example is shown, and there is a sign of film formation, but the film formation is less, slag is easy to fall off, which indicates that the adhesion on the steel is poor. Other properties are: shore hardness of 40.8D, compressive strength of 11.23MPa, bending strength of 5.81MPa, impact strength of 3.4350kJ/m2Oxygen index 30.0% (oxygen concentration), resistivity 16.8366 m.OMEGA.mm.
Hardness (> 40D), impact strength (> 1.5 KJ/m) of the product of this example2) The compression strength (more than 6MPa), the bending strength (more than 4MPa), the friction coefficient (less than 0.32) and the abrasion loss (less than 0.02g) all meet the application requirements, and the lubricant is a better solid lubricant for the kiln and the converter in comprehensive consideration. Friction by one slaveThe sheet is seen, the defects are that the film is formed with powder slag, and the operation table needs to be cleaned in time.
Example 2
The formulation amounts of a solid lubricant for a kiln converter are given in table 2 below.
Table 2 example 2 amounts of each raw material component in the lubricant
A solid lubricant for a kiln converter is prepared by the following method:
(1) material mixing process
Weighing measured solid powder materials, mixing the solid powder materials including a lubricant (polypropylene wax), a lubricating aid (graphite), a thickening agent (organic bentonite), a flame retardant (magnesium hydroxide), a friction modifier (talcum powder) and a wear-resisting agent (zinc powder), and pouring the mixture into a high-speed crusher for crushing and uniformly mixing;
(2) melt dispersion process
Pouring the mixed materials into a beaker, placing the beaker in an electric heating sleeve, controlling the digital display temperature at 200 ℃, and heating and melting. Opening a dispersion machine, adjusting the rotation number to 800r/min, and dispersing the sample while melting for 30 min;
(3) normal temperature curing process
Pouring the solid lubricant into a forming mold (the size of which is shown in figure 2) from a beaker while the solid lubricant is hot, cooling and forming at normal temperature, and solidifying after 5 min;
(4) cooling demolding process
And taking out the solidified solid lubricant from the die to obtain a finished product.
The prepared lubricant has the use temperature range of-20 ℃ to 400 ℃. The friction test was carried out under a load of 20N and a friction speed of 1.2m/s for a test time of 30 min. And (3) testing results: the coefficient of friction was 0.252 (as shown in FIG. 3 b) and the wear loss was 0.0139 g. FIG. 4b is a film-forming pattern of the steel disc after the friction test of the product of this example, wherein the film-forming pattern is observed to show that the film-forming pattern is uniform, but the color of the film mark is lighter, which indicates the adhesion of the film mark on the steelThe strength is slightly improved. Other properties are: shore hardness of 40.8D, compressive strength of 9.33MPa, bending strength of 8.41MPa, impact strength of 2.9363KJ/m2Oxygen index 30.1%, resistivity 17.3952 m.OMEGA.mm.
Hardness (> 40D), impact strength (> 1.5 KJ/m) of the product of this example2) The compression strength (more than 6MPa), the bending strength (more than 4MPa), the friction coefficient (less than 0.32) and the abrasion loss (less than 0.02g) all meet the application requirements, and the lubricant is a better solid lubricant for the kiln and the converter in comprehensive consideration. From the aspect of film forming effect, the film is formed uniformly and has a relatively shallow thickness.
Example 3
The formulation amounts of a solid lubricant for a kiln converter are given in table 3 below.
Table 3 example 3 amounts of each raw material component in the lubricant
A solid lubricant for a kiln converter is prepared by the following method:
(1) material mixing process
Weighing measured solid powder materials, mixing the solid powder materials including a lubricant (polyethylene wax), a lubricating aid (graphite), a thickening agent (organic bentonite), a flame retardant (magnesium hydroxide) and a wear-resisting agent (zinc powder), pouring the mixture into a high-speed pulverizer, pulverizing and uniformly mixing;
(2) melt dispersion process
Pouring the mixed materials into a beaker, placing the beaker in an electric heating sleeve, controlling the temperature at 250 ℃, and heating and melting. Opening a dispersion machine, rotating at 600r/min to melt and disperse the sample for 30 min;
(3) normal temperature curing process
Pouring the solid lubricant into a forming mold (the size of which is shown in figure 2) from a beaker while the solid lubricant is hot, cooling and forming at normal temperature, and solidifying after 5 min;
(4) cooling demolding process
And taking out the solidified solid lubricant from the die to obtain a finished product.
The prepared lubricant has the use temperature range of-20 ℃ to 400 ℃. The friction test was carried out under a load of 20N and a friction speed of 1.2m/s for a test time of 30 min. And (3) testing results: the coefficient of friction was 0.231 (as shown in FIG. 3 c) and the amount of wear was 0.0057 g. As shown in fig. 4c, it is a film-forming diagram on the steel plate after the friction test of the product of this example, and it can be seen from the diagram that there is a film-forming phenomenon, and the color of the formed film is dark, and there is a phenomenon of more film lamination, which indicates that the formed film is very easy to form, but the carrying capacity is poor. Other properties are: shore hardness of 41.4D, compressive strength of 11.22MPa, bending strength of 7.49MPa, impact strength of 2.7875KJ/m2Oxygen index 29.9%, resistivity 16.9719 m.OMEGA.mm.
Hardness (> 40D), impact strength (> 1.5 KJ/m) of the product of this example2) The compression strength (more than 6MPa), the bending strength (more than 4MPa), the friction coefficient (less than 0.32) and the abrasion loss (less than 0.02g) all meet the application requirements, and the lubricant is a better solid lubricant for the kiln and the converter in comprehensive consideration. From the aspect of film forming effect, the formed film is not uniform, the color is dark, more films are laminated, and the friction coefficient and the abrasion loss are the lowest.
Example 4
The formulation amounts of a solid lubricant for a kiln converter are given in table 4 below.
Table 4 example 4 amounts of each raw material component in the lubricant
A solid lubricant for a kiln converter is prepared by the following method:
(1) material mixing process
Weighing measured solid powder materials, mixing the solid powder materials including a lubricant (polypropylene wax), a lubricating aid (graphite), a thickening agent (organic bentonite), a flame retardant (magnesium hydroxide) and a wear-resisting agent (zinc powder), pouring the mixture into a high-speed crusher, and crushing and uniformly mixing the mixture;
(2) melt dispersion process
Pouring the mixed materials into a beaker, placing the beaker in an electric heating sleeve, controlling the temperature to be 250 ℃, and heating and melting. Opening a dispersion machine, rotating at the speed of 800r/min, and dispersing the sample while melting for 20 min;
(3) normal temperature curing process
Pouring the solid lubricant into a forming mold (the size of which is shown in figure 2) from a beaker while the solid lubricant is hot, cooling and forming at normal temperature, and solidifying after 5 min;
(4) cooling demolding process
And taking out the solidified solid lubricant from the die to obtain a finished product.
The prepared lubricant has the use temperature range of-20 ℃ to 400 ℃. The friction test was carried out under a load of 20N and a friction speed of 1.2m/s for a test time of 30 min. And (3) testing results: the coefficient of friction was 0.301 (as shown in FIG. 3 d) and the amount of wear was 0.0183 g. As shown in fig. 4d, it is a film forming diagram on the steel disc after the friction test of the product of this example, and it can be seen from the diagram that there is an obvious film forming phenomenon, the most uniform, and there is no film lamination and no powder slag, which indicates that it has strong adhesion on the steel and moderate bearing capacity. Other properties are: shore hardness of 40.6D, compressive strength of 9.84MPa, bending strength of 6.26MPa, impact strength of 2.5913KJ/m2Oxygen index 30.1%, resistivity 16.7661 m.OMEGA.mm.
The hardness (> 40D), the impact strength (> 1.5KJ/m2), the compressive strength (> 6MPa), the bending strength (> 4MPa), the friction coefficient (< 0.32) and the abrasion loss (< 0.02g) of the product of the example all meet the application requirements, and the product is a better solid lubricant for the kiln and the converter in comprehensive consideration. From the aspect of film forming effect, the coating is smooth and uniform, has strong adhesive force on steel, has moderate bearing capacity, but has slightly larger friction coefficient and abrasion loss.
The raw materials listed in the invention, the upper and lower limits and interval values of the raw materials of the invention, and the upper and lower limits and interval values of the process parameters (such as temperature, time and the like) can all realize the invention, and the examples are not listed.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (3)
1. The solid lubricant for the kiln converter is characterized by comprising the following components in percentage by mass:
55% -75% of a lubricant; 2.5 to 10 percent of lubricating additive; 1.2 to 1.6 percent of thickening agent; 13% -23% of a flame retardant; 15% -25% of a friction modifier; 0% -2% of antifriction agent;
the lubricant is polyethylene wax or polypropylene wax; the thickening agent is organic bentonite; the friction modifier is talcum powder; the lubricating additive is graphite; the wear-resisting agent is zinc powder.
2. The solid lubricant for a kiln converter according to claim 1, characterized in that: the flame retardant is magnesium hydroxide.
3. A preparation process of a solid lubricant for a kiln converter is characterized by comprising the following steps:
step one, weighing the following substances in percentage by mass: 55% -75% of a lubricant; 2.5 to 10 percent of lubricating additive; 1.2 to 1.6 percent of thickening agent; 13% -23% of a flame retardant; 15% -25% of a friction modifier; 0% -2% of antifriction agent; mixing and crushing;
step two, melting and dispersing the product obtained in the step one for 20-30min at the temperature of 200-;
step three, pouring the melt obtained in the step two into a forming die while the melt is hot, and cooling for 3-10min at normal temperature for forming;
step four, taking the solid lubricant solidified in the step three out of the die to obtain a finished product of the solid lubricant for the kiln converter;
the lubricant is paraffin, specifically polyethylene wax or polypropylene wax; the lubricating assistant is graphite; the thickening agent is organic bentonite; the flame retardant is magnesium hydroxide; the friction modifier is talcum powder; the wear-resisting agent is zinc powder.
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| CN201710666344.XA CN107557115B (en) | 2017-08-07 | 2017-08-07 | Solid lubricant for kiln and converter and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710666344.XA CN107557115B (en) | 2017-08-07 | 2017-08-07 | Solid lubricant for kiln and converter and preparation process thereof |
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| CN107557115A CN107557115A (en) | 2018-01-09 |
| CN107557115B true CN107557115B (en) | 2020-04-21 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59159898A (en) * | 1983-03-03 | 1984-09-10 | Nippon Funmatsu Gokin Kk | Solid lubricating piece for lubrication of pantograph slider |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619261B (en) * | 2009-07-17 | 2013-04-17 | 无锡中石油润滑脂有限责任公司 | Flame-retarded lubricating grease and preparation method thereof |
| CN102399614B (en) * | 2010-09-07 | 2013-06-26 | 张军 | Composite solid lubricating agent, its preparation method and construction technology |
| CN102559348B (en) * | 2011-12-21 | 2014-06-25 | 洛阳正本润滑材料有限公司 | Lubricating oil for rotary kiln wheel belts and method for preparing same |
| CN103254987B (en) * | 2013-05-19 | 2014-05-14 | 广西大学 | High-temperature furnace top lubricating grease |
| CN105969488A (en) * | 2016-05-06 | 2016-09-28 | 中国石油化工股份有限公司 | Lubricating oil composition for supporting roller large bearing shell of rotary kiln and preparation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59159898A (en) * | 1983-03-03 | 1984-09-10 | Nippon Funmatsu Gokin Kk | Solid lubricating piece for lubrication of pantograph slider |
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